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Simplifying -1(-8r + 4) = 6r + -20 Reorder the terms: -1(4 + -8r) = 6r + -20 (4 * -1 + -8r * -1) = 6r + -20 (-4 + 8r) = 6r + -20 Reorder the terms: -4 + 8r = -20 + 6r Solving -4 + 8r = -20 + 6r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-6r' to each side of the equation. -4 + 8r + -6r = -20 + 6r + -6r Combine like terms: 8r + -6r = 2r -4 + 2r = -20 + 6r + -6r Combine like terms: 6r + -6r = 0 -4 + 2r = -20 + 0 -4 + 2r = -20 Add '4' to each side of the equation. -4 + 4 + 2r = -20 + 4 Combine like terms: -4 + 4 = 0 0 + 2r = -20 + 4 2r = -20 + 4 Combine like terms: -20 + 4 = -16 2r = -16 Divide each side by '2'. r = -8 Simplifying r = -8
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